Hidden picture: send a friend a set of coordinates and see what they draw
What you needSquared paper and a partner. Each of you needs a grid numbered 0 to 10 on both axes.
MethodSecretly draw a simple shape using straight lines between grid points, write down its corners as an ordered list, and have your partner plot and join them without seeing the picture.
Then compareCompare the two drawings. If they differ, find the first point where they diverge and work out who made the mistake and what kind it was.
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